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Search Publications by: Curt A. Richter (Fed)

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Displaying 101 - 125 of 475

Field Effects of Current Crowding at Metal-MoS2 Contacts

March 10, 2016
Author(s)
Hui H. Yuan, Guangjun Cheng, Sheng Yu, Angela R. Hight Walker, Curt A. Richter, Qiliang Li
Gate assisted contact-end Kelvin test structures and gate assisted 4-probe structures have been designed and fabricated to measure the field effects of current crowding at the source/drain contacts of top-gate MoS2 field effect transistors. The transistors

Non-volatile Memory Devices with Redox-active Diruthenium Molecular Compound

February 12, 2016
Author(s)
Sujitra J. Pookpanratana, Hao Zhu, Emily G. Bittle, Sean Natoli, Tong Ren, Curt A. Richter, Qiliang Li, Christina A. Hacker
Non-volatile Flash-based memory devices, which incorporate a novel redox-active diruthenium molecule, is demonstrated. The memory device is in a capacitor structure, metal/oxide/molecule/oxide/silicon, where the diruthenium molecule is covalently attached

Fe-catalyzed etching of exfoliated graphite through carbon hydrogenation

January 8, 2016
Author(s)
Guangjun Cheng, Christina A. Hacker, Curt A. Richter, Angela R. Hight Walker
We present an investigation on the etching of graphite catalyzed by the particles produced by dewetting Fe thin films on graphite in forming gas. Raman mapping of the etched graphite shows the thickness variation in the etched channels and reveals that the

Edge-state Transport in Graphene p-n Junctions in the Quantum Hall Regime

December 7, 2015
Author(s)
Nikolai Klimov, Son T. Le, Jun Yan, Pratik Agnihotri, Everett Comfort, Ji Ung Lee, David B. Newell, Curt A. Richter
We experimentally investigate charge carrier transport in a graphene p-n junction device by using independent p-type and n-type electrostatic gating which allow full characterization of the junction interface in the quantum Hall regime covering a wide

Self-Assembled Monolayers Impact Cobalt Interfacial Structure in Nanoelectronic Junctions

March 5, 2015
Author(s)
Sujitra J. Pookpanratana, Leigh Lydecker, Curt A. Richter, Christina A. Hacker
The formation of molecular monolayers on template-stripped cobalt surfaces is reported. The quality of the alkane-based molecular structure was confirmed through spectroscopic measurements. We find that the self-assembly of bifunctional molecules has

Influence of Metal?MoS2 Interface on MoS2 Transistor Performance: Comparison of Ag and Ti Contacts

December 16, 2014
Author(s)
Hui H. Yuan, Guangjun Cheng, Lin You, Haitao Li, Hao Zhu, Wei Li, Joseph J. Kopanski, Yaw S. Obeng, Angela R. Hight Walker, David J. Gundlach, Curt A. Richter, D. E. Ioannou, Qiliang Li
In this work, we present a study of enhancing MoS2 transistor performance by using proper metal contact. We found that the on-state current of MoS2 field-effect transistors with 30 nm Au/ 30 nm Ag contacts is enhanced more than 60 times and the

Polarization of Bi2Te3 Thin Film in a Floating-Gate Capacitor Structure

December 8, 2014
Author(s)
Hui H. Yuan, Kai Zhang, Haitao Li, Hao Zhu, John E. Bonevich, Helmut Baumgart, Curt A. Richter, Qiliang Li
Metal-Oxide-Semiconductor capacitors with Bi2Te3 thin film sandwiched and embedded inside the oxide layer have been fabricated and studied. The capacitors exhibit ferroelectric-like hysteresis which is a result of the robust, reversible polarization of

Attachment of a Reduction-Oxidative Active Diruthenium Compound to Au and Si Surfaces by Click Chemistry

August 10, 2014
Author(s)
Sujitra J. Pookpanratana, Joseph W. Robertson, Curt A. Richter, Christina A. Hacker, Lee J. Richter, Julia Savchenko, Steven Cummings, Tong Ren
We report the formation of molecular monolayers containing redox-active diruthenium(II,III) compound to gold and silicon surfaces via “click” chemistry. The use of Cu-catalyzed azide-alkyne cycloaddition enables modular design of molecular surfaces and